HP 4262A User Manual

Section IV Model 4262A
Preliminary Operations
——PRELIMINARY OPERATIONS
Before beginning performance test, adjustment, or calibration of 4262A,
check fundamental operating.conditions of the instrument and perform
display ZERO adjustments in accord with the following procedures:
1) Confirm that power line power voltage in use is appropriate for the instrument operating
power voltage.
2) Depress LINE pushbutton and confirm that all the front panel displays and indicators
momentarily illuminate. The 4262A functions are automatically set to capacitance
measurement mode.
3) ZERO offset adjustment should be made whenever a test fixture or DUT box is connected
to 4262A UNKNOWN terminals. Adjust C ZERO ADJ and L ZERO ADJ controls so as
to fully compensate for stray capacitance and residual inductance of equipment con-
nected to UNKNOWN terminals. Adjustment procedures to adjust for individual test
equipment used are provided in steps 3-a and 3-b which follow.
3-a) 16361A/16362A or user built DUT box.
1. Disconnect shorting bars from 4262A UNKNOWN terminals. Connect
test leads between 4262A UNKNOWN terminals and DUT box.
2., Set 4262A FUNCTION to C. Set TEST SIGNAL frequency as appropriate
to DUT box being used.
3. Set range control of DUT box to open-circuit position (2pF range on
16361A or 1pF range on 16362A). The 4262A is automatically set to
its lowest capacitance measurement mode range.
4. Adjust C ZERO ADJ control so that capacitance readout on 4262A LCR
display is identical to calibrated value of DUT box range.
~ 5. Set 4262A FUNCTION to L.
6. Set range control of DUT box to short-circuit position (20m range on
16361 A or on 163624). ‘
7. Adjust L ZERO ADJ control for 000 counts on LCR display.
Note
To permit easy adjustment of ZERO ADJ
controls for an individual DUT box, each
DUT box should be equipped with short and
open circuit ranges which provide OuH and
OpF (practical values), respectively.
4-2

HP 4262A Specifications

General

Brand	HP
Model	4262A
Category	Measuring Instruments
Language	English